-- Were way past the days of messy, anything-you-get-for-free downloading on Napster. People want their music the way museums want their collections and sommeliers want their wine cellars: curated.

Any not by just anyone  by experts. Thats why major tech companies are snapping up digital music services that offer the ability to create playlists suited to users changing moods, activities, even the weather.

On Tuesday, Google confirmed rumors it is buying Songza, a music app that makes customized playlists  including ones inspired by current weather conditions thanks to a partnership with the Weather Channel. The free, ad-supported app also offers sounds for a range of moods  cocky, lush, visceral and rowdy, to name a few, and for activities such as dirt road driving or shopping at a vintage store.